Struct mz_compute::sink::subscribe::SubscribeProtocol

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struct SubscribeProtocol {
    pub sink_id: GlobalId,
    pub sink_as_of: Antichain<Timestamp>,
    pub subscribe_response_buffer: Option<Rc<RefCell<Vec<(GlobalId, SubscribeResponse)>>>>,
    pub prev_upper: Antichain<Timestamp>,
    pub poison: Option<String>,
}
Expand description

A type that guides the transmission of rows back to the coordinator.

A protocol instance may send rows indefinitely in response to send_batch calls. A send_batch call advancing the upper to the empty frontier is used to indicate the end of a stream. If the stream is not advanced to the empty frontier, the Drop implementation sends an indication that the protocol has finished without completion.

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§sink_id: GlobalId§sink_as_of: Antichain<Timestamp>§subscribe_response_buffer: Option<Rc<RefCell<Vec<(GlobalId, SubscribeResponse)>>>>§prev_upper: Antichain<Timestamp>§poison: Option<String>

The error poisoning this subscribe, if any.

As soon as a subscribe has encountered an error, it is poisoned: It will only return the same error in subsequent batches, until it is dropped. The subscribe protocol currently does not support retracting errors (database-issues#5182).

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impl SubscribeProtocol

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fn send_batch( &mut self, upper: Antichain<Timestamp>, rows: &mut Vec<(Timestamp, Row, Diff)>, errors: &mut Vec<(Timestamp, DataflowError, Diff)>, )

Attempt to send a batch of rows with the given upper.

This method filters the updates to send based on the provided upper. Updates are only sent when their times are before upper. If upper has not advanced far enough, no batch will be sent. rows and errors that have been sent are drained from their respective vectors, only entries that have not been sent remain after the call returns. The caller is expected to re-submit these entries, potentially along with new ones, at a later upper.

The subscribe protocol only supports reporting a single error. Because of this, it will only actually send the first error received in a SubscribeResponse. Subsequent errors are dropped. To simplify life for the caller, this method still maintains the illusion that errors are handled the same way as rows.

Trait Implementations§

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impl Drop for SubscribeProtocol

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fn drop(&mut self)

Executes the destructor for this type. Read more

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